copying bugfix from language translator to language translation

Author: nfriedly

language-translation/v2.js

@@ -211,7 +211,7 @@ LanguageTranslationV2.prototype.identify = function(params, callback) {
     defaultOptions: extend(true, {}, this._options, {
       headers: {
         'accept':'application/json',
-        'content-type': 'plain/text'
+        'content-type': 'text/plain'
       }
     })
   };

lib/requestwrapper.js

@@ -70,7 +70,8 @@ function formatErrorIfExists(cb) {
         });
         body.error = errObj.description;
       }
-      error = new Error(body.error || 'Error Code: ' + body.error_code);
+      // language translaton returns json with error_code and error_message
+      error = new Error(body.error || body.error_message || 'Error Code: ' + body.error_code);
       error.code = body.error_code;
       Object.keys(body).forEach(function(key) {
         error[key] = body[key];